#include <stdio.h>
void main ()
{
	float sum=0;
	float a=10.2,b=9;
	int i;

	printf ("10.2-9=%.10f\n" ,a-b) ;//1.2
	
	a=100000.2 ;
	printf ("100000.2-9=%.10f\n" ,a-b) ;//99991.2

	for(i=0;i<4000000;i++)
		sum+=0.1;//400000
	printf("sum=%f\n",sum) ;
	
	return;
}

